Automatic refrigerating apparatus.



No. 630,6l6. PatentedAug. 8, I899.

- A. T. MARSHALL.

AUTOMATIC REFRIGERATING APPARATUS.

iApplication fiXed June-4, 1897.) (-No Model.) 5 Sheets-Sheet I Inventor.

Vviu'lesses.

' Z I umnmx w.

6 t BJ I Attorneys.

No. 630,6l6.

Patented Aug. 8, I899. A. T. MARSHALL.

AUTOMATIC REFRIGERATING APPARATUS.

(Application filed June 4, 1897.)

5 Sheats8heet 2 (No Model.)

a gnventor.

3x K/.%; Attorneys.

\Nitnesses.

w -J-BM in: Noam Farms 00.. rumoumoq WASHINGTON. o. c.

No. 630,6l6. Patented Aug. 8, I899. A. T. MARSHALL.

AUTOMATIC REFRIGERATING APPARATUS.

(Appliolfion fllsd June 4, 1807') (lo Model.) 5 Sheets-Sheet 3.

wn om To m m m cm mm 170 j v A y @Q 7v 3. d I i M 0+ W Patented Aug. 8, I899.

No. 630,6l6.

A. T. MARSHALL.

AUTOMATIC REFRIGERATING APPARATUS.

[Applic ation flied June 4, 1897.)

5 Sheets-Sheet 4 6N0 Model.)

Inventor. d 61.6.

s e s s e n t W i; 6 Z A no rn e118,

N0. 630,6l6/ Patented Aug. 8, I899.

. A. T. MARSHALL.

AUTOMATIC REFRIGEBATING APPARATUS.

(Application filed June 4, 1897.) (No Model.) 5 Sheets-Sheet 5.

F g 1 o UNITED STATES PATENT OFFICE.

ALBERT T. MARSHALL, OF BROCKTON, MASSACHUSET'IS.

AUTOMATIC REFmeEnAr'inc APPARATUS.

SYECIFIGATION forming part Of Letters Patent N0, 680,616, dated. August 8, 1899.

Application filed J1me 1897. semi No. 659,428. (No model.)

To (tZZ whom it may concern: l

lie it known that I, ALBERT T. MAnsHAnL, a citizen of the United States, residing at l-lrockton, in the county of llymouth and State of Massachusetts, hare invented a new and useful Improvement in Automatic Re frigerating Apparatus, of which the following is a specification. I v

My invention relates to that class of refrigerating-machines which ordinarilyeznploy anhydrous ammonia as a refrigerating medium; and the objects of my invention are, first, to provide means for automatically regulating the admission of the refrigerating medium to the expansion pipes or chambers; second, to combine a thermostat and rheostat to automatically control the motor which drives the pump,so that the pump will be acthated to maintain a constant temperature in the refrigerated space; third, to provide means for automatically cutting out the motor under certain conditions, and, fourth, to provide means for automatically regulating the circulation ofwvater employed for cooling tails of the construction of the automatic cutoutdevices shown, as in my companion application, filed August 29, 1898, Serial No.

689,749, I have shown and claimed a. specific construction of combined thermostat and rheostat and specific forms of cut-out devices for controlling the same.

To these ends myinvention consists of the parts and combinations of parts, as hereinafter described, and more particularly pointed out in the claims at the end of this specification.

In the accompanying five sheets of drawings, Figure 1 is a longitudinal sectional view of a refrigerating apparatus constructed according to my invention, the watereclrculating pipes vbeing omitted. Fig. 2- is a transverse sectional view of. the same. Fig. 3 is a detail sectional view illustrating the forth of automatic valve which I preferably employ for regulating the admission of the refrigen aling medium to the expansion-pipes. Fig.

4 is a detail sectional view illustrating the form of hand-valve which I preferably employ for controllingthe refrigerating medium. Fig. 5 is a transverse sectional view illustrating the combined thermostat and rheostat which I preferably employ for controllingthe electric motor which drives the pump. Fig. 6 is a front view of the same. 7 is a sectional plan View thereof. Fig. 8 is a detail View, to be hereinafter referred to. Fig. 9 is a detail view illustrating a stop mechanism which i may employ to automatically operate the rheostat when the electric current for driving the motor is shut off at the central station or otherwise. Fig. 10 is a detail view illustrating the construction which I preferably employ for controlling the water circulation, and Fig. 11 is a detail view of a safety cut-out which I may employ for stopping the pump when the supply of water is out off.

A refrigerating apparatus constructed according to my invention comprises a storagechamber for liquid anhydrous ammonia or other refrigerating medium, the expansion pipes or coils in which the liquid ammonia is allowed to expand into the form of a gas, and

apump for drawing the refrigerating medium from the expansion-pipes and condensing it back to a liquid after the same has been cooled preferably by means of a circulation '01. water.

The expansion pipes or coils are preferably immersed in a brinetank; but, ifdesired, the brine-tank. may be omitted, and the expansion pipes or'coils alone may be located directly in the space to be refrigerated;

The parts may be of any of the ordinary or approved constructions, and while in the ac companying drawings I have illustrated my.

invention applied to a comparatively small cabinet refrigerator or chest it is to be understood that my inventions are equally appli- I cable to the larger forms of ice .or refrigerating machines. v

To. control the admission of refrigerating medium to theexpansion-pipes, I, preferabl y employ a needle-valve for throttling or regulatin g the flow of the expansion medium, and I automatically operate said needle-valve by the combined action of two diaphragms, one

diaphragm being acted upon by the pressure of the expansion medium onth e suction side of the pump and the other diaphragm being acted upon by the pressureof a body of expansion medium confined in a closed vessel.

The hand-actuated shut-off valves which I may employ at various points in the ammonia-circulating pipes are preferably provided with diaphragms, which maybe screwed down into engagement with suitable valve-seats.

In practice I preferably drive the pump by means of an electric motor, and in order to maintain a constant temperature in the refrigerated space I control the electric motor by means of a thermostatic rod. 'In some cases the thermostatic rod may be connected to simply start and stop the motor; but in practice I prefer to combine the thermostatic bar with a spring-actuated rheostat in order that the motor may be started up slowly and the full strength of the current turned on graduallyJ Tocool the condensed refrigerating medium, I preferably employ a circulation of water, and I control the admission of water to the coolibg-chamber bymeans of a needle-valve, which is automatically actuated by a diaphragm controlled by the pressure of the refrigerating medium. If the supply of water should fail or should be shut off and the pump should continue in action, a heavy pressure might be generated in the condensingcoil, and in order to prevent this from happening 1 preferably provide a safety cut-out device .for stopping the motor when the water-supply is shut off.

Referring to the first two sheets of drawings and in detail, A designates any of the ordinary or approved forms of easing, which,

as illustrated, is divided into compartments I B and C, the compartment 0 being the space which is to be refrigerated and the compartment B being arranged to contain the greater part of my refrigerating apparatus. Mounted in the rear part of the space 0 to be refrigerated is a fiat rectangular brine-tank 10, containing the expansion pipes or coils 11..

The outlet-pipe 12 from the expansion-coils 11 is connected to a header 13. A shut-off valve is arranged in the upper part of the header13, and leading from said header 13is a pipe 14, connected to a pressure-gage G, a pipe 15, whicliconnects to one of the diaphragm-chambers which control the expansion-valve, rcgulatingthe admission of ref rigerating mediu m to the expansion-pipes 11,and a pipe 16, which is connected to the suction side of a pump or condenser 17. 'lhe'pump 17 may be driven in any of the ordinaryor preferred manners, and, as illustrated,the same is preferably driven by a belt 18 from an electric motor 19, secured on top of thecasing A. The pressure side of the pump 17is connected by a pipe 20 to a header 21. Leading from the header 21 is apipe 22, connected to a diaphragm-chamber 23, which contains the diaphragrnfor automatically con trolling the circulation of water in the cooling-chamber, a pipe 24,which leads up to a second pressuregage G, and a pipe 240, which leads down to a coil located in the coolingchainber 25. The header 21 may be provided at one end with one of my ammonia-shutoff valves. vFrom the coil or worm in the cooling-chamber 25 the condensed refrigerating medium passes into a storage tank or chamber26. The tank 26 is provided at its end with a head 27, having an am in onia-shut-otl? valve. Leading from the head 27 is a filling or blow-oil? pipe 28,which is closed at its end by means of another one ofmyammonia-shut-offvalves. Alsoleading up from the head 27 is a pipe 29, which connects to the eypansion-valve 30. Leading from the expansion-valve 30 is a pipe 3l,which connects to the inlet side of the expansioncoil 11.

In the operation of a refrigerating apparatus as thus constructed the'am moniaorother refrigerating medium will be drawn by the pump 17 from the expansion-pipes 11 in the form of a gas and will be condensed in the eooling-chzunber 25 to a liquid. The circulation of water around the coil inside of thecooling-tank 25 will be automatically controlled, ashereinafterexplained. From the storagetank 26 the ammonia or other refrigerating medium will pass in the form of a liquid to the expansion-valve 30, said expansion-valve 30 being, as hereinafter explained, automatically controlled to regulate the admission of the refrigerating medium to the expansionpipes 11, where the ammonia again expands into the form of a gas and cools the brine in the tank 10.

In order to maintain a constant temperature in the refrigerated space 0, 1 preferably mount a hard-rubber expansion thermostatic rod 32 in the space to be refrigerated and combine said thermostatic rod with a springaetuated rheostat to control the electric motor 19. Instead of mounting the expansionrod or thermostatic rod 32 in the space to be refrigerated Che same may be immersed in the brine-tank, and when thus located the thermostatic rod 62 and the devices controlled thereby will maintain the brine at a constant temperature.

The construction which I employ for automatically operating the expansion-valve 30 is .most clearly illustrated 'in Figs. 1, 2, and 3.

As shown in Figs. 1 and 2, a shelf I is located near the upper part of the compartment B. Secured on the under side of the shelf I are the two diaphragm-chambers and 36. The pipe 15, before referred to, is connected to the diaphragm-chamber 35. A small closed pipe or vessel H is located in the brine-tank and is provided with a blowoff. valve or I no header h, by means of which liquid anhydrous ammonia or other expansible medium can be introduced therein. The pipe H connects to the diaphragm -.ehamber 36. The construction of the diaphragm chambers 35 and 36 and .the connections for operating the valve 30 are most clearly illustrated in Fig. 3. As

:shown in this figure, the diaphragm-chamber 35 is formed by two castings 37 and 38.

Olamped in position between the castings 37 the lever 42 a given pressure in the closed and 38 is a flexible rubber diaphragm 39. Below the flexible diaphragm 39, in position to be actuated thereby, is afollower 40,which is provided'with'a socket for receiving a stud 41, said stud 41 being pivotally connected at its lower end to a lever 42. I

In order to form a tight joint between the pipe 15 and the casting 37, I preferably threa'd a wrought-iron washer 43 onto the end of the pipe H and arrange a rubber packing-washer 44 between the wrought-iron washer 43'and a bushing 45, threaded into the casting 37. This form of connection I have found in practice affords a very simple and inexpensive manner of connecting an ammonia-pipe to a Valve casing or casting, and I ordinarily employ similar connections wherever an aimmonia-pipe is to be tapped into or connected with other fittings or castings.

The diapl1ragm'-casing 36 is formed by the castings 47 and 48, which are of similar form to the castings 37 and 38 and inclose a flexible diaphragm 49, said diaphragm 49 being arranged to act upon a follower 135, which contains a stud 136, also pivotally connected to the lever 42. The lever 12 is pivotally mounted upon a bolt or studl37, which bolt l3? is adjustably mounted in a slot in a bracket 138 and passes through the slotsl39 needle or shut-01f section 34 for co'ntrollihgor throttling the flow ofhthe refrigerating medium. The valve-stem 330 extends up through a suitable stuffing-box 1:11 and is pivotally connected at its upper end to the lever 42. l

y In the operation of mycons truction for antomatically. controlling the expansion-valve as thus arranged the anhydrous ammonia or other expansive medium contained in the closed pipe or chamber 1-1 will I exert a-pressure on the diaphragm 49; If the temperaure of the brine-in the brine-tank 10 rises,

I the pressure in the closedpipe or chamber-H 49 will tend to open; the expansion-valve 30' will increase,and the action of the diaphragm more widely, so as to admit an increased supply of the refrigerating medium to the expans'ion-pipes 11. Instead ofiminersin g the pipe or chamber H in the brine-tank it is obvious that the same may be simply located 'in-the space to be refrigerated"; but in all cases the expan sion-ooil 11 and the closed coil or chaml b e r H should have their external surfaceseih. posedto the-same temperature. The pressure in the expansion ooilll is transmitted through the pipe 15 to'ac't-on the-flexible diathe expansion-valve30.

While the pump is working.

By ohangingthe position of the pivot of pipe or chamber H may be made to balance any desired pressure in the expansion-coil 11.

The pressure of the ammonia or other expanding agent in the expanding-coil 11 and in the closed pipe or chamber H depends directly upon their temperatures, and consequently an'ydesired difiere'nce of temperature can be maintained between the refrigerating medium in the expansion-coils and the expansion medium in the closed pipe or chamber H Whenever the pump stops,the pressure in the expansion-coil 11 soon rises to that maintained in the closed pipe or chamber H, and lso adjust the pivot of the lever 42 that this rise in temperature and consequent rise in pressure will always be sutlicient to close the expansion-valve, and the expansion-valve will remain closed until the pump-has been started and has run long enough to reduce the pressure in the expan sion-coil to the difference for which it was set,

and as the pump continues to run the pressure in the expansion-coil ll grad ually falls as the brine'cools. As thusarranged my expansioinvalve will be automatically operated in precisely the same way that an expansion-o valve Would be worked by hand'to obtain the best resultsthat is to say, the expansionvalve is always closed when the pressures in the two coils are alike, regardless of the tem- 5 at various points in rn y ammonia-circulating system is most clearly illustrated in Fig, l.

' As shown in this .figure, the ammonia-shutotf valve 2; comprises a casing '50, having an inlet-passage 51, leading to a yalve-seat-52,

and an outlet-passage 520. 'Threaded onto. theorising 50'is a cover-plate 53, and secured red inplace by the cover-plate 53 is a compound diaphragm comprising a flexible metallic dia- 'phragm 54 and a rubber diaphragm 55.

Threaded into the cover-plate 53 is an operating-screw 57 which engages a washer 58 to hold the diaphragm firmly down into engagement with its valveseat'. v Fitting looselyinside of the operating-screw. 57 is a stem 510, which is provided with a head or nut at its upper end and a reduced section at its lower end, which passes through the diaphragms and is threaded into a nut 56 on the under side thereof. In practice I have found that this form of am monia-shut-off valve provides a very simple and' e'flicient construction for shutting otfjhe-fiow of ammoniagat various points'in its circulating system, an while in Fig. 411 have illustrated simply t atform of shut-0E valve which-is employed, for instance,

'at the end ot-,the blow-0H3 or filling pipe 28 (shown in Figs-1 and 2') itisto be understood that the other 'ammoniaeshut-off valves r,

illustrated at various points of my refrigerating apparatus, are of similar construction, the shape of the valve-casing being simply modified to suit the different locations in which said valves. are employed.

The construction which I preferably employ for automatically controlling the motor is most clearly illustrated in Figs. 5 to 9. As shown in these figures, 33 designates a casing having a cover-plate 34, of slate or other insulating material. Mounted on the cover-plate 34 is a rheostat-arm, which is controlled and actuated by spring clockwork mounted inside of the casing 33. As illustrated, the clockwork which I preferably employ for actuating my rheostatcomprises a main shaft 60, having a spring 61 coiled thereon. Mounted on the shaft 60 is a gear, which meshes with and drives a pinion secured on a second shaft 62. Mounted on the shaft 62 is a gear, which meshes with and drives a pinion secured on a third shaft 63. A gear on the third shaft 63 meshes with and drives a pinion on a fourth shaft 64. A sheet-metal plate or fan 65 is secured upon the. shaft 64. Mounted on'a stud 66, near one side of the casing, is a starting-pawl G7 and a stopping-pawl 68. The pawls 6'7 and 68 are provided at their lower ends with projections or feet for engaging notches in disks 69 and 70, which disks are secured upon the shaft 62, as shown most plainlyin Fig. 8. At their upper ends the pawls 67 and 68 are provided with downwardly-extending projections for engaging the fan 65. A lever 71 is pivoted in the easing 33 and is provided with'a hook 720 for engaging thestarting-pawl 67 and with a pin tailpiece of the stopping-pawl 68.

730 for engaging a downwardly-extending The lever 71 is actuated by means of aslide 72, which at its outer end is provided with an elbow fitting between the stop-nuts 73 and 74, which are adjustably threaded onto the expansion-rod or thermostat 32. The stop-nuts 73 and 74 may be adjusted on the expansion-rod or thermostat 32 to operate the pivoted lever 71 at any desired temperature. When the temperature in the refrigerated space rises so that the thermostatic rod 32 will have expanded sufficiently to shift the lever 71, said lever 71, by means of its hook 720, will raise the starting-pawl 67 out of engagement with its disk 69, and the clockwork will be started in operation and will continue to turn-until the foot-piece at the lower end of the stoppingpawl 68 engages its notch in the disk 70.

, When the temperature in the refrigerated space falls so that the expansion-rod 32 will shift the pivoted lever 71 in the opposite direction, the stopping-pawl 68 will be raised and the clockwork will be started and will continue to turn until the foot-piece at the lower end of the starting-pawl engages with its notch in the disk 69. The notches in the disks 69 and are arranged, as most clearly shown in Fig. 8, so that when the starting-pawl 67 is lifted the shaft 62 will be given approximately threequarters of a turn, and when the stopping pawl 68 is lifted the shaft 62 will be given substantially a quarter of a turn. As shown most clearly in Fig. 7, an insulating-bushing is loosely splined on the end of the shaft 62 and carries a spring contact-arm 76. The spring contactarm 7 6 is provided at its ends with contact-sections 77 and 78 and engages with and is confined in position by means of a metallic bridge-piece 75. As shown most clearly in Fig. 6, the contact-section 77 is ar ranged to cooperate with sector-shaped contact-pieces '79, 80, 81, 82, and 83, and the con- 80 tact-piece 78 is arranged to codperate with sector-shaped contact-pieces 84 and 85. As thus mounted, the arm 76 will exert a spring" pressure both on its contact-pieces 77 and 78 and on the bridge-piece 75, and by means of 85 this construction I obtain nearly perfect electrical connections between the bridge-piece 75 and the spring 76 and between the contact-pieces 77 and 78 and the sector-shaped contact-pieces with which they cooperate, Binding-posts 86,87,88,89, and are mounted on/the cover-plate 3d of the casing 33. The wires (1 and a, carrying the current for'opera-ting the motor, are connected to the hind ing-posts 86 and 88, respectively. The wires 2) and b, which connect with the armature of the electric motor 19, are connected to the binding-posts 87 and 88, respectively. The wires-c and c, which are connected to the field-magnets of the electric motor 19, are connected to the binding-posts 89 and 90, re-- spectively. The sector shaped contact-sections 79 and 84- are insulated or without elec-- tric connections, so that when the contact-arm 76 is in the position illustrated in Fig. 6 the current will be entirely shut oif from the motor 19. The sector-shaped contact-sections 80, 81, and 82 are connected to suitable connected resistance-coils 91, 92, and 93, respectively, so that as the contact-arm 76 is retated or turned to the right, as shown in Fig. 6, the armature-current will be first sent through all said resistance-coils, and said coils will then be successively cut out from the, circuit in the ordinary manner, so that when m 5 the contact-arm 76 has made substantially V tl1ree-quarters of a revolution the full strength of the current will be turned onto the fieldmagnets and armature of the motor 19, and the pump will be started at fullspeed. I

It is obvious, of course, that the thermostatic rod-32 could, if desired, be arranged simply to make and break the current for starting and stopping the motor 19; butI have found in practice that where such a construction is employed thearmatureof the motor will be quickly burned out and injured, whereas by combining my thermostat witha. spring-controlled rheosmt I have provided a construction which will start the motor up gradually, so that the armature of the same will not be injured or burned out.

If the current in the street should be temporarily shut off for anv reason, so that the ure, the diaphragm-chamber 23 is formedili y figure, a shunt from the wires a and a, is car-- ried around the electric magnets 910 and 920, so as to normally hold up a weight 94, carried by a supplemental cutout pawl 940, pivoted on a stud 93. The supplementalcut-out pawl 940 is provided with projections or foot-pieces 950, corresponding with the projections of the starting-pieced]. The notched disk 69,which cooperates with the main starting-pawl 67, may be made wide enough to cooperate with the toot-piece at the lower end of the supplemental pawl 940, or the supplemental pawl 940 may be arranged to engage a separate notched disk corresponding with the notched disk 69 and secured on the same shaft therewith, as shown in my companion application for patent filed August 29, 1898, Serial No. 689,749. When thisarrangementis employed -aud the ourrent'in the street fails or is shut o'ff for any reason, the magnets 910 and 920 wi l r be demagnetized, the weight 94 will'fall, the

stopping-pawl'68 will be lifted as the'supplemental pawl 9 is arranged to engage a pin carried by an arm 95 of said pawl 68, and the clockwork will thus be automatically started, by the failure or shutting olf of the current in the street to automatically turn the rheostat-arm to the position illustrated in the drawings, thus cutting out the motor.

- cover-plate 97, bolted thereto.

phragm 98 is mounted in the diaphragm- The means which I preferably employ for automatically controlling the circulation of.

water in the cooling-tank are most clearly illustrated in Fig. 10. I As shown in this means'of a bracket or casting 96, havin a chamber so asto be actuated by the pressure jfrom pipe 22. Engaging the under side of the flexible diaphragm 98 is a plunger 99, on-

gaging one end of a' lever 100, pivotally mounted in a bracket or support 101. Near its'opposite end'the lever 100 is connected to welve-casing 102 and is provided at its lowerond witha'needle section or valve for cona valve-stem 105, which extends down into a trolling the fiowofwater through a water-inlet pipe .103. From the, valve-casing 102 a pipe 104 leads 'to' thecooling-chamber 25.

position ini a fsocket in'th bracketedby Mounted on the. outer end of the pivoted lever 100 is a rod 106,-carrying acoiled spring 107, which engages" a threaded bushing 10S, whichb'iishing may be secured in itsadj usted As shown in this cooling-chamber 25.

accident of this kind from happening, I pro- A flexible diameans of a check-n at 109. In the normal operation of this construction the tension of the spring 107 is adjusted so that when the pressure inthe worm or coil inside the coolingchamber 25 rises above the desired point the water-valve 102 will be opened and a supply of water will be admitted to the cooling-chamber 25. a

In certain cases it might happen that the supply of waterto the controlling-valve 102 might be shut ofi or might for some reason fail, and if the pump 17.shouldbe continued in operation a dangerous pressure might perhaps be generated in the coil inside of the In order to-prevent an vide a safety cut-out device for automatically stopping the electric motor19 when the watersupply fails. a

As illustrated in Figs. 10 and 11, the rod 106 is provided at its-lower end with a spring 110, the pressure of which may be adjusted by means of washers 111 anda nut 112. In the normal operation-of thisconstruction the spring 110 will be raised into engagement with a stop-piece 122 when the water-valve 102 is opened. Wheneveran abnormally heavy pressure is generated in the pipe22,

the pivoted lever 100 will be raised against the resistance of the spring 110. A wire 113 I ispivotally secured to the outer end of the lever and extends down through a piv-,

oted yoke 114 and is provided with an abutment at its lower end. When the lever 100 is raised to an abnormally high positio n the pivoted yoke 114 will be operated to pull down upon an upwardly-extending wire-115.

The wire 115 is connected at its upper end to operate an automatic cut-out, the preferred.

form of which is most clearlyillustrated in Fig. 11. ing-post 117 is introduced into the c'ircuita of the street and is normally connected by a pivoted conmeoting-piecev 118. The con heating-piece 118 is normally hel'dlup by means of a bell-crauk stop-leverl19.- The wire 115 is connected to the bell-crank lever.

119, so that when said wire 115 is pulled down the stop-lever 119 will be moved away from 'the contact piece 118, so that the electrical connection betweenthe binding-postslldand, I-

117 will be rbrok'en and the current will be automatically cut off from the motor 19, which drives the pump.

As shown in this figure, the hind I The operation of the various devices which I employ in my automatic refrigerating apparatus have beeusofully described in explaining the construction thereof that a description of the operation of theparts as a whole isthought to be unnecessary,

I. am aware that many changes maybe'made in the construction of refrigerating apparatus, by those who are skilled in the artwith:

out departing frornthe scope of my invention as expressed in the claims and that the several features of my invention as expressed;

in the claims may be used in combination too Lil

with different classes of refrigerating-machines and in different constructions from that in connection with which they are herein illustrated. l do'not desire, therefore, to be limited to the forms which I have shown and described; but

What E do claim, and desire to secure by Letters Patent oi the United States, is-

1. In a refrigerating apparatus, the combination of expansioirpipes, a pump connected thereto, storage-chamber tor the liquid refrigerating medium, an expansion-valve for regulating the ilow of the refrigerating medium to the expansion-pipes, and means for automatically actuating said valve, comprising a lever, means for adjustingthe fulcrum of said lever, a diaphragm thermostatically actuated bydhe pressure of confined body expansible medium and connected to the lever one side of its fulcrum, and a diaphragm acted upon byihe pressure of therelj'rigerating medium in the expansion-pipes connected to the lever at the opposite sidcol' its fulcrum, substantially as described.

2. In a refrigerating apparatus, the combination of a brinc-tanl 10, the expansionpipcs 11 therein, a single valve 30 regulating the flow of the refrigerating medium to the pipes 11, and means for automatically controlling the valve 30, comprising a bracket 138, a stud 137 adjustably mounted therein, a lever #2 pivoted on the stud 137,2 diaphragm iil'counected to act on one side of the lever 42, a pipe ll containing an expansiblc medium for actuating the diaphragm 49 immersed in the tank 10, and a diaphragm 39 actuated by the pressure in the pipes '11. connected to act on the other side of the lever 42, substantially as described.

3. In arefrigeratingapparatus, the combi nation of a circulating system for the refrigerating medium, a pump, an electric motor therefor, and a combined thermostat and rheostat for controlling the motor to maintain a substantially constant temperature in the space to be refrigerated, substantially as described.

. a. In a refrigerating apparatus, the combination of expansion pipes or coils for alloW-.

ing a volatile refrigerating medium to expand into the form of a gas, a pump "connected thereto, a storage-chamber for liquid refrigcratingmedium,Water-supplyingconnections for cooling the refrigerating medium While the same is being condensed to liquid form,

. a valve for throttling the water-supply, and

thereto, a storage-chamber for liquid rcfrigerati ng in ediu-m, water-supplying connections for cooling the refrigerating medium While the same is being condensed to liquid form, a valve for throttling the water-supply, means for stopping the pump and a diaphragm con trolled by the pressure generated by the pump connected to normally control said valve and to automatically stop the pump when an air normal pressure is generated there-by, substantially described. 7

(3. In a refrigerating apparatus, the combination of expansion pi es or coils for allowing volatile refrigerating medium to expand into the form of a gas, a pump connected thereto, a storage-chainbcr for liquid refrigerating medi um, water-supplying connections for cooling the refrigerating medium While the same is being condensed to liquid form, a valve for throttling the Water-supply, an electric motor for actuating the pump, a cutout for breaking the motor-circuit, and a single diaphragm controlled by the pressure generated by the pump connected to normally control the water-valve and to automatically actuate the cut-out when an abnormal pressure is generated by the pump, substantially as described.

7. in a refrigerating apparatus, the combination of a circulating system for the refrigerating medium, a pump therefor, an electric motor actuating said pu mp, a cut-out for said electric motor, water-supplying connections for coolingthccirculalingmediunnandaflexible diaphragm acted upon by the pressure of the refrigerating medium to normally control the water-supplying connections and to actuate the cut-out when an excessive pressure is generated by the pump, substantially as de' scribed.

S. In a refrigerating apparatus, the combination of a circulating system for the refrig ICC) to normally form a stop for the lever 100, and

Witnesses:

PHILIP W. SOUTHGA'IE, Louis W'. SoU'rucAru. 

